Exercise machine



FIG. 1 is a front, perspective view of an exercise machine showing the new design;

FIG. 2 is a rear, perspective view of the exercise machine;

FIG. 3 is a front elevation view of the exercise machine shown in FIG. 1;

FIG. 4 is a side elevation view of the exercise machine shown in FIG. 1;

FIG. 5 is a top plan view of the exercise machine shown in FIG. 1; and,

FIG. 6 is a bottom plan view of the exercise machine shown in FIG. 1.

The broken lines represent portions of the structure that form no part of the claim. 

The ornamental design for the exercise machine, as shown and described. 